A popular federal-state program that provides health coverage to millions of children in lower- and middle-class families is up for renewal Sept. 30.

But in a deeply divided Congress facing such pressing concerns as extending the nation’s debt ceiling, finding money for the Hurricane Harvey cleanup and keeping the government open, some health advocates fear that the program for children could be in jeopardy or that conservative lawmakers will seek changes to limit the program’s reach.

“With all that is on Congress’ plate, I am very worried that a strong, wildly successful program with strong public support will get lost in the shuffle and force states to begin the process of winding down CHIP,” said Bruce Lesley, president of the advocacy group First Focus.

The Children’s Health Insurance Program covers more than 9 million kids — children typically from families not poor enough to qualify for Medicaid, the state-federal program that covers low-income people.

Income eligibility levels for CHIP vary widely among states, though most set thresholds at or below 200 percent of the poverty level, about $49,000 for a family of four. Unlike Medicaid, CHIP is usually not free. Enrolled families pay an average premium of about $127 a year.

The 20-year-old program has bipartisan support — and one of its original sponsors is Sen. Orrin Hatch (R-Utah), chairman of the Finance Committee, which has scheduled a hearing on reauthorization Thursday.

It’s possible in the jampacked legislative calendar this month that other health-related provisions could be attached to a CHIP reauthorization bill — such as Republican-sponsored changes to the Affordable Care Act. Those changes could keep a bill from getting enough support from Democrats and some Republicans in the Senate for passage.

“It’s the only vehicle in health care policy other than the federal budget that’s going to be moving, so it’s likely extraneous items are likely to be added to it,” said Christopher Pope, senior fellow at the conservative Manhattan Institute.

Supporters of CHIP also worry about changes in eligibility that could dampen enrollment.

The Affordable Care Act bumped up federal funding of CHIP by 23 percentage points and forbid states from restricting eligibility rules that were in place in 2010. Both of those requirements continue through September 2019.

The added funding means a dozen states have their entire CHIP programs paid for by the federal government. In the fiscal year that ended last September, states spent less than $2 billion of the total $15.6 billion in CHIP spending, according to the conservative Heritage Foundation, which says states should pay a higher share of the program’s costs.

President Donald Trump’s budget request this spring called for immediately eliminating the ACA bump in funding and ending the restriction on states curtailing eligibility — often referred to as the “maintenance of effort” provision.

But that provision has kept CHIP stable at a time when the individual insurance market faces uncertainty, said Joan Alker, director of Georgetown University’s Center for Children and Families in Washington, D.C.

Advocates note that if children have to leave CHIP and move to marketplace coverage, their families may be forced to pay higher out-of-pocket costs for their kids’ health care.

Without the maintenance of effort requirement, advocates fear that states would be more likely to do what Arizona did during the last economic downturn: It froze enrollment from December 2009 until last June. The move was allowed because it took effect before the ACA’s restriction began in March 2010.

Meanwhile, Republicans are not united in their views of the maintenance of effort requirement. Some favor it because they say it shifts more authority of the program to states. Others say it would likely lead some states to move many CHIP enrollees either into Medicaid or private insurance policies sold on the Obamacare exchanges — both areas where the federal government may pay an even higher share of the costs, Pope said.

“It’s not a simple win for anything, but you can see why some governors would like it,” he said.

At a House subcommittee hearing in June, some Republicans lawmakers expressed concerns about extending the enhanced federal funding for CHIP.

“This increase in funding has challenged the program by both shifting the nature of shared responsibility of the state Children’s Health Insurance Program to the federal government and making states more dependent on federal dollars,” said Rep. Michael Burgess (R-Texas), who heads the Energy and Commerce subcommittee on health.

A committee staff memo prepared for the hearing said taking away the extra funding — but leaving the maintenance of effort requirement in place — would not result in fewer children having coverage.

Without renewal of the program, Arizona, Minnesota, North Carolina and the District of Columbia would run out of their federal CHIP funding by the end of this year. By March 2018, an additional 27 states would exhaust their funds.

Minnesota and D.C. officials said all children covered by CHIP will transition to Medicaid if funding is cut.

Alker said the enhanced funding has helped several states, including Nevada and Utah, expand coverage to legal immigrant children instead of having to face a five-year wait.

Given the complexity of making major changes and the tight congressional timeline, some experts say Congress may opt to pass a clean CHIP bill — without major changes to the program.

“Congress is in this month so few days that I can easily see CHIP simply being reauthorized without strings attached,” said Joe Antos, a health economist with the conservative American Enterprise Institute, because lawmakers’ attention is more likely to focus on the debt-limit deadline, the budget resolution and tax reform.

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Federal funding that provides insurance for nearly 340,000 Florida kids will expire in September unless Congress acts. It’s called the Children’s Health Insurance Program and it supports kids who don’t qualify for Medicaid.